Hi all

I tried to do a bit of DIY when my gears were making a grating noise on the large chainring, but I've messed up my front derailleur cable and am struggling to get it back on. I've managed to adjust the L limit screw and everything runs smoothly with small front chainring, but it doesn't seem to want to go onto the large chainring. Also the H limit screw doesn't appear to do much when I turn it to its extremes?

Any pointers?

Thanks, Paul